Java Tutorial/Swing Event/ListSelectionListener
Содержание
- 1 Implement a graphical list selection monitor
- 2 Listening to JList Events with a ListSelectionListener
- 3 ListSelectionEvent
- 4 ListSelectionListener and ListSelectionEvent
- 5 ListSelectionModel and ListSelectionListener
- 6 ListSelectionModel, JTable and ListSelectionListener
- 7 Shared ListSelectionHandler
Implement a graphical list selection monitor
<source lang="java">
import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; public class SelectionMonitor extends JPanel {
String label[] = { "1", "2", "3"};
JCheckBox checks[] = new JCheckBox[label.length];
JList list = new JList(label);
public SelectionMonitor() {
JScrollPane pane = new JScrollPane(list);
add(pane);
list.addListSelectionListener(new RadioUpdater());
for (int i = 0; i < label.length; i++) {
checks[i] = new JCheckBox("Selection " + i);
add(checks[i]);
}
}
public static void main(String s[]) {
JFrame frame = new JFrame("Selection Monitor");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new SelectionMonitor());
frame.pack();
frame.setVisible(true);
}
} class RadioUpdater implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
if ((!e.getValueIsAdjusting()) || (e.getFirstIndex() == -1))
return;
for (int i = e.getFirstIndex(); i <= e.getLastIndex(); i++) {
System.out.println(((JList) e.getSource()).isSelectedIndex(i));
}
}
}</source>
Listening to JList Events with a ListSelectionListener
If you want to know when elements of a JList have been selected, you need to attach a ListSelectionListener to the JList or the ListSelectionModel.
<source lang="java">
public interface ListSelectionListener extends EventListener {
public void valueChanged(ListSelectionEvent e);
}</source>
ListSelectionEvent
<source lang="java">
import javax.swing.JFrame; import javax.swing.JList; import javax.swing.ListSelectionModel; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; public class Main extends JFrame {
public Main() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
String items[] = { "A", "B", "C", "D" };
JList list = new JList(items);
ListSelectionModel selModel = list.getSelectionModel();
selModel.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if (!e.getValueIsAdjusting()) {
System.out.println("selection changed: " + e.getFirstIndex());
}
}
});
getContentPane().add(list);
pack();
setVisible(true);
}
public static void main(String[] args) {
Main m = new Main();
}
}</source>
ListSelectionListener and ListSelectionEvent
<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/*
* ListDataEventDemo.java requires the Java Look and Feel Graphics * Repository (jlfgr-1_0.jar). You can download this file from * http://java.sun.ru/developer/techDocs/hi/repository/ * Put it in the class path using one of the following commands * (assuming jlfgr-1_0.jar is in a subdirectory named jars): * * java -cp .;jars/jlfgr-1_0.jar ListDataEventDemo [Microsoft Windows] * java -cp .:jars/jlfgr-1_0.jar ListDataEventDemo [UNIX] */
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.Insets; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.DefaultListModel; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.ListSelectionModel; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; public class ListDataEventDemo extends JPanel implements ListSelectionListener {
private JList list;
private DefaultListModel listModel;
private static final String addString = "Add";
private static final String deleteString = "Delete";
private static final String upString = "Move up";
private static final String downString = "Move down";
private JButton addButton;
private JButton deleteButton;
private JButton upButton;
private JButton downButton;
private JTextField nameField;
private JTextArea log;
static private String newline = "\n";
public ListDataEventDemo() {
super(new BorderLayout());
// Create and populate the list model.
listModel = new DefaultListModel();
listModel.addElement("Whistler, Canada");
listModel.addElement("Jackson Hole, Wyoming");
listModel.addElement("Squaw Valley, California");
listModel.addElement("Telluride, Colorado");
listModel.addElement("Taos, New Mexico");
listModel.addElement("Snowbird, Utah");
listModel.addElement("Chamonix, France");
listModel.addElement("Banff, Canada");
listModel.addElement("Arapahoe Basin, Colorado");
listModel.addElement("Kirkwood, California");
listModel.addElement("Sun Valley, Idaho");
listModel.addListDataListener(new MyListDataListener());
// Create the list and put it in a scroll pane.
list = new JList(listModel);
list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
list.setSelectedIndex(0);
list.addListSelectionListener(this);
JScrollPane listScrollPane = new JScrollPane(list);
// Create the list-modifying buttons.
addButton = new JButton(addString);
addButton.setActionCommand(addString);
addButton.addActionListener(new AddButtonListener());
deleteButton = new JButton(deleteString);
deleteButton.setActionCommand(deleteString);
deleteButton.addActionListener(new DeleteButtonListener());
ImageIcon icon = createImageIcon("Up16");
if (icon != null) {
upButton = new JButton(icon);
upButton.setMargin(new Insets(0, 0, 0, 0));
} else {
upButton = new JButton("Move up");
}
upButton.setToolTipText("Move the currently selected list item higher.");
upButton.setActionCommand(upString);
upButton.addActionListener(new UpDownListener());
icon = createImageIcon("Down16");
if (icon != null) {
downButton = new JButton(icon);
downButton.setMargin(new Insets(0, 0, 0, 0));
} else {
downButton = new JButton("Move down");
}
downButton.setToolTipText("Move the currently selected list item lower.");
downButton.setActionCommand(downString);
downButton.addActionListener(new UpDownListener());
JPanel upDownPanel = new JPanel(new GridLayout(2, 1));
upDownPanel.add(upButton);
upDownPanel.add(downButton);
// Create the text field for entering new names.
nameField = new JTextField(15);
nameField.addActionListener(new AddButtonListener());
String name = listModel.getElementAt(list.getSelectedIndex()).toString();
nameField.setText(name);
// Create a control panel, using the default FlowLayout.
JPanel buttonPane = new JPanel();
buttonPane.add(nameField);
buttonPane.add(addButton);
buttonPane.add(deleteButton);
buttonPane.add(upDownPanel);
// Create the log for reporting list data events.
log = new JTextArea(10, 20);
JScrollPane logScrollPane = new JScrollPane(log);
// Create a split pane for the log and the list.
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
listScrollPane, logScrollPane);
splitPane.setResizeWeight(0.5);
// Put everything together.
add(buttonPane, BorderLayout.PAGE_START);
add(splitPane, BorderLayout.CENTER);
}
class MyListDataListener implements ListDataListener {
public void contentsChanged(ListDataEvent e) {
log.append("contentsChanged: " + e.getIndex0() + ", " + e.getIndex1()
+ newline);
log.setCaretPosition(log.getDocument().getLength());
}
public void intervalAdded(ListDataEvent e) {
log.append("intervalAdded: " + e.getIndex0() + ", " + e.getIndex1()
+ newline);
log.setCaretPosition(log.getDocument().getLength());
}
public void intervalRemoved(ListDataEvent e) {
log.append("intervalRemoved: " + e.getIndex0() + ", " + e.getIndex1()
+ newline);
log.setCaretPosition(log.getDocument().getLength());
}
}
class DeleteButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
/*
* This method can be called only if there"s a valid selection, so go
* ahead and remove whatever"s selected.
*/
ListSelectionModel lsm = list.getSelectionModel();
int firstSelected = lsm.getMinSelectionIndex();
int lastSelected = lsm.getMaxSelectionIndex();
listModel.removeRange(firstSelected, lastSelected);
int size = listModel.size();
if (size == 0) {
// List is empty: disable delete, up, and down buttons.
deleteButton.setEnabled(false);
upButton.setEnabled(false);
downButton.setEnabled(false);
} else {
// Adjust the selection.
if (firstSelected == listModel.getSize()) {
// Removed item in last position.
firstSelected--;
}
list.setSelectedIndex(firstSelected);
}
}
}
/** A listener shared by the text field and add button. */
class AddButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (nameField.getText().equals("")) {
// User didn"t type in a name...
Toolkit.getDefaultToolkit().beep();
return;
}
int index = list.getSelectedIndex();
int size = listModel.getSize();
// If no selection or if item in last position is selected,
// add the new one to end of list, and select new one.
if (index == -1 || (index + 1 == size)) {
listModel.addElement(nameField.getText());
list.setSelectedIndex(size);
// Otherwise insert the new one after the current selection,
// and select new one.
} else {
listModel.insertElementAt(nameField.getText(), index + 1);
list.setSelectedIndex(index + 1);
}
}
}
// Listen for clicks on the up and down arrow buttons.
class UpDownListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
// This method can be called only when
// there"s a valid selection,
// so go ahead and move the list item.
int moveMe = list.getSelectedIndex();
if (e.getActionCommand().equals(upString)) {
// UP ARROW BUTTON
if (moveMe != 0) {
// not already at top
swap(moveMe, moveMe - 1);
list.setSelectedIndex(moveMe - 1);
list.ensureIndexIsVisible(moveMe - 1);
}
} else {
// DOWN ARROW BUTTON
if (moveMe != listModel.getSize() - 1) {
// not already at bottom
swap(moveMe, moveMe + 1);
list.setSelectedIndex(moveMe + 1);
list.ensureIndexIsVisible(moveMe + 1);
}
}
}
}
// Swap two elements in the list.
private void swap(int a, int b) {
Object aObject = listModel.getElementAt(a);
Object bObject = listModel.getElementAt(b);
listModel.set(a, bObject);
listModel.set(b, aObject);
}
// Listener method for list selection changes.
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting() == false) {
if (list.getSelectedIndex() == -1) {
// No selection: disable delete, up, and down buttons.
deleteButton.setEnabled(false);
upButton.setEnabled(false);
downButton.setEnabled(false);
nameField.setText("");
} else if (list.getSelectedIndices().length > 1) {
// Multiple selection: disable up and down buttons.
deleteButton.setEnabled(true);
upButton.setEnabled(false);
downButton.setEnabled(false);
} else {
// Single selection: permit all operations.
deleteButton.setEnabled(true);
upButton.setEnabled(true);
downButton.setEnabled(true);
nameField.setText(list.getSelectedValue().toString());
}
}
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String imageName) {
String imgLocation = "toolbarButtonGraphics/navigation/" + imageName
+ ".gif";
java.net.URL imageURL = ListDataEventDemo.class.getResource(imgLocation);
if (imageURL == null) {
System.err.println("Resource not found: " + imgLocation);
return null;
} else {
return new ImageIcon(imageURL);
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("ListDataEventDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
JComponent newContentPane = new ListDataEventDemo();
newContentPane.setOpaque(true); // content panes must be opaque
frame.setContentPane(newContentPane);
// Don"t let the content pane get too small.
// (Works if the Java look and feel provides
// the window decorations.)
newContentPane.setMinimumSize(new Dimension(newContentPane
.getPreferredSize().width, 100));
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application"s GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}</source>
ListSelectionModel and ListSelectionListener
<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/*
* ListSelectionDemo.java requires no other files. */
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTable; import javax.swing.JTextArea; import javax.swing.ListSelectionModel; import javax.swing.ScrollPaneConstants; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; public class ListSelectionDemo extends JPanel {
JTextArea output;
JList list;
JTable table;
String newline = "\n";
ListSelectionModel listSelectionModel;
public ListSelectionDemo() {
super(new BorderLayout());
String[] listData = { "one", "two", "three", "four", "five", "six", "seven" };
String[] columnNames = { "French", "Spanish", "Italian" };
list = new JList(listData);
listSelectionModel = list.getSelectionModel();
listSelectionModel
.addListSelectionListener(new SharedListSelectionHandler());
JScrollPane listPane = new JScrollPane(list);
JPanel controlPane = new JPanel();
String[] modes = { "SINGLE_SELECTION", "SINGLE_INTERVAL_SELECTION",
"MULTIPLE_INTERVAL_SELECTION" };
final JComboBox comboBox = new JComboBox(modes);
comboBox.setSelectedIndex(2);
comboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String newMode = (String) comboBox.getSelectedItem();
if (newMode.equals("SINGLE_SELECTION")) {
listSelectionModel
.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
} else if (newMode.equals("SINGLE_INTERVAL_SELECTION")) {
listSelectionModel
.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
} else {
listSelectionModel
.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
}
output.append("----------" + "Mode: " + newMode + "----------"
+ newline);
}
});
controlPane.add(new JLabel("Selection mode:"));
controlPane.add(comboBox);
// Build output area.
output = new JTextArea(1, 10);
output.setEditable(false);
JScrollPane outputPane = new JScrollPane(output,
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
// Do the layout.
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
add(splitPane, BorderLayout.CENTER);
JPanel topHalf = new JPanel();
topHalf.setLayout(new BoxLayout(topHalf, BoxLayout.LINE_AXIS));
JPanel listContainer = new JPanel(new GridLayout(1, 1));
listContainer.setBorder(BorderFactory.createTitledBorder("List"));
listContainer.add(listPane);
topHalf.setBorder(BorderFactory.createEmptyBorder(5, 5, 0, 5));
topHalf.add(listContainer);
// topHalf.add(tableContainer);
topHalf.setMinimumSize(new Dimension(100, 50));
topHalf.setPreferredSize(new Dimension(100, 110));
splitPane.add(topHalf);
JPanel bottomHalf = new JPanel(new BorderLayout());
bottomHalf.add(controlPane, BorderLayout.PAGE_START);
bottomHalf.add(outputPane, BorderLayout.CENTER);
// XXX: next line needed if bottomHalf is a scroll pane:
// bottomHalf.setMinimumSize(new Dimension(400, 50));
bottomHalf.setPreferredSize(new Dimension(450, 135));
splitPane.add(bottomHalf);
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("ListSelectionDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
ListSelectionDemo demo = new ListSelectionDemo();
demo.setOpaque(true);
frame.setContentPane(demo);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application"s GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
class SharedListSelectionHandler implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
ListSelectionModel lsm = (ListSelectionModel) e.getSource();
int firstIndex = e.getFirstIndex();
int lastIndex = e.getLastIndex();
boolean isAdjusting = e.getValueIsAdjusting();
output.append("Event for indexes " + firstIndex + " - " + lastIndex
+ "; isAdjusting is " + isAdjusting + "; selected indexes:");
if (lsm.isSelectionEmpty()) {
output.append(" <none>");
} else {
// Find out which indexes are selected.
int minIndex = lsm.getMinSelectionIndex();
int maxIndex = lsm.getMaxSelectionIndex();
for (int i = minIndex; i <= maxIndex; i++) {
if (lsm.isSelectedIndex(i)) {
output.append(" " + i);
}
}
}
output.append(newline);
output.setCaretPosition(output.getDocument().getLength());
}
}
}</source>
ListSelectionModel, JTable and ListSelectionListener
<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/*
* TableSelectionDemo.java requires no other files. */
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTable; import javax.swing.JTextArea; import javax.swing.ListSelectionModel; import javax.swing.ScrollPaneConstants; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; public class TableSelectionDemo extends JPanel {
JTextArea output;
JList list;
JTable table;
String newline = "\n";
ListSelectionModel listSelectionModel;
public TableSelectionDemo() {
super(new BorderLayout());
String[] columnNames = { "French", "Spanish", "Italian" };
String[][] tableData = { { "un", "uno", "uno" }, { "deux", "dos", "due" },
{ "trois", "tres", "tre" }, { "quatre", "cuatro", "quattro" },
{ "cinq", "cinco", "cinque" }, { "six", "seis", "sei" },
{ "sept", "siete", "sette" } };
table = new JTable(tableData, columnNames);
listSelectionModel = table.getSelectionModel();
listSelectionModel
.addListSelectionListener(new SharedListSelectionHandler());
table.setSelectionModel(listSelectionModel);
JScrollPane tablePane = new JScrollPane(table);
// Build control area (use default FlowLayout).
JPanel controlPane = new JPanel();
String[] modes = { "SINGLE_SELECTION", "SINGLE_INTERVAL_SELECTION",
"MULTIPLE_INTERVAL_SELECTION" };
final JComboBox comboBox = new JComboBox(modes);
comboBox.setSelectedIndex(2);
comboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String newMode = (String) comboBox.getSelectedItem();
if (newMode.equals("SINGLE_SELECTION")) {
listSelectionModel
.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
} else if (newMode.equals("SINGLE_INTERVAL_SELECTION")) {
listSelectionModel
.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
} else {
listSelectionModel
.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
}
output.append("----------" + "Mode: " + newMode + "----------"
+ newline);
}
});
controlPane.add(new JLabel("Selection mode:"));
controlPane.add(comboBox);
// Build output area.
output = new JTextArea(1, 10);
output.setEditable(false);
JScrollPane outputPane = new JScrollPane(output,
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
// Do the layout.
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
add(splitPane, BorderLayout.CENTER);
JPanel topHalf = new JPanel();
topHalf.setLayout(new BoxLayout(topHalf, BoxLayout.LINE_AXIS));
JPanel listContainer = new JPanel(new GridLayout(1, 1));
JPanel tableContainer = new JPanel(new GridLayout(1, 1));
tableContainer.setBorder(BorderFactory.createTitledBorder("Table"));
tableContainer.add(tablePane);
tablePane.setPreferredSize(new Dimension(420, 130));
topHalf.setBorder(BorderFactory.createEmptyBorder(5, 5, 0, 5));
topHalf.add(listContainer);
topHalf.add(tableContainer);
topHalf.setMinimumSize(new Dimension(250, 50));
topHalf.setPreferredSize(new Dimension(200, 110));
splitPane.add(topHalf);
JPanel bottomHalf = new JPanel(new BorderLayout());
bottomHalf.add(controlPane, BorderLayout.PAGE_START);
bottomHalf.add(outputPane, BorderLayout.CENTER);
// XXX: next line needed if bottomHalf is a scroll pane:
// bottomHalf.setMinimumSize(new Dimension(400, 50));
bottomHalf.setPreferredSize(new Dimension(450, 110));
splitPane.add(bottomHalf);
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("TableSelectionDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
TableSelectionDemo demo = new TableSelectionDemo();
demo.setOpaque(true);
frame.setContentPane(demo);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application"s GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
class SharedListSelectionHandler implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
ListSelectionModel lsm = (ListSelectionModel) e.getSource();
int firstIndex = e.getFirstIndex();
int lastIndex = e.getLastIndex();
boolean isAdjusting = e.getValueIsAdjusting();
output.append("Event for indexes " + firstIndex + " - " + lastIndex
+ "; isAdjusting is " + isAdjusting + "; selected indexes:");
if (lsm.isSelectionEmpty()) {
output.append(" <none>");
} else {
// Find out which indexes are selected.
int minIndex = lsm.getMinSelectionIndex();
int maxIndex = lsm.getMaxSelectionIndex();
for (int i = minIndex; i <= maxIndex; i++) {
if (lsm.isSelectedIndex(i)) {
output.append(" " + i);
}
}
}
output.append(newline);
output.setCaretPosition(output.getDocument().getLength());
}
}
}</source>
<source lang="java">
import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.ListSelectionModel; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; class SharedListSelectionHandler implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
ListSelectionModel lsm = (ListSelectionModel) e.getSource();
int firstIndex = e.getFirstIndex();
int lastIndex = e.getLastIndex();
boolean isAdjusting = e.getValueIsAdjusting();
System.out.println("Event for indexes " + firstIndex + " - " + lastIndex + "; isAdjusting is "
+ isAdjusting + "; selected indexes:");
if (lsm.isSelectionEmpty()) {
System.out.println(" <none>");
} else {
// Find out which indexes are selected.
int minIndex = lsm.getMinSelectionIndex();
int maxIndex = lsm.getMaxSelectionIndex();
for (int i = minIndex; i <= maxIndex; i++) {
if (lsm.isSelectedIndex(i)) {
System.out.println(" " + i);
}
}
}
}
} public class AddingTableSelectionListener {
static String labels[] = { "A", "B", "C", "D", "E", "F", "G" };
public static void main(String args[]) {
JFrame frame = new JFrame("Modifying Model");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
String[] columnNames = { "French", "Spanish", "Italian" };
String[][] tableData = { { "un", "uno", "uno" }, { "deux", "dos", "due" },
{ "trois", "tres", "tre" }, { "quatre", "cuatro", "quattro" },
{ "cinq", "cinco", "cinque" }, { "six", "seis", "sei" }, { "sept", "siete", "sette" } };
JTable table = new JTable(tableData, columnNames);
table.getSelectionModel().addListSelectionListener(new SharedListSelectionHandler());
JScrollPane scrollPane1 = new JScrollPane(table);
frame.add(scrollPane1, BorderLayout.CENTER);
frame.setSize(640, 300);
frame.setVisible(true);
}
}</source>
